论文信息 - A Fully Differential Third-Order VHF GM-c Filter Based on Linear Transformation Techniques

A Fully Differential Third-Order VHF GM-c Filter Based on Linear Transformation Techniques

A fully differential third-order very high frequency (VHF) Gm–C filter based on linear transformation (LT) techniques is presented in this paper. The systematic design method and the procedure are developed to realize LT Gm–C filters efficiently. A third-order Butterworth lowpass filter embedded bandgap and bias circuits with 200 MHz cutoff frequency is implemented in the TSMC 0.18 μm 1P6M process. The total harmonic distortion (THD) of the proposed filter is - 43 dB with input signal 0.5 Vp-p and output loading capacitance 1 pF at 200 MHz. Power dissipation is 9.77 mW under 1.8 V supply voltage. Its core area occupies 0.188 × 0.1862. Post simulation and experimental results that confirm the theoretical analysis are obtained. Furthermore, the proposed circuits can be extended to high-order Chebychev and elliptic filters.

Jiann-Jong Chen | Yuh-Shyan Hwang | Jen-Hung Lai

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